FIELD: oil-and-gas industry.
SUBSTANCE: proposed device comprises main stem with catching hook and top joint for pipe string. Note here that said joint features diameter larger than that of additional drilled stems and is fitted with extra stem similar to main one with catching hook directed towards catching hook of the main stem. Main and additional stems are hollow and elastic and equipped with radial flushing channels arranged above catching hooks and aligned therewith. Bottom end of the joint between stems can interact with deflecting wedge top end.
EFFECT: higher reliability, expanded performances, easier extraction.
5 dwg
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